I had the RSS XML Parsing error a while ago and was applying all the fixes
basically
– adding ob_clean();?> before <?php echo ‘<?xml version=”1.0″
– check your customised theme’s function.php for blanks/spaces between <? php and ?>

I was using Firefox for my testing and it didn’t work. Then I tried IE and Safari and the feed worked.

At 1st I thought it was Firefox error, then I tried clearing the cache on Firefox, reloaded and the feed appeared!

So in case anyone encounter the same prob.. try Clear Private Data when you are testing. You might have already solved the problem but not getting the latest codes when you refresh browser.

I’m not a code whiz, it’s just my intuitive guess. hope this helps someone out there 🙂